Communism is not a magic button, it is a process of development. Reaching the higher-stage communism you’re referring to is very likely to be outside any of our lifetimes it is far easier to talk about socialism as the transitional state between capitalism and eventual communism. Communists being in power doesn’t mean we magically press a button and suddenly everyone lives in a utopia of stateless material abundance, it just means the socialist state is working towards it, the transition between capitalism and communism.
What the socialist state itself looks like differs widely based on the conditions, just like capitalism has a huge amount of variance based on the conditions. Each nation has very different needs, problems and cultural idiosyncrasies that result in the socialist state needing to look quite different for each of them. The outcome is ultimately determined by those conditions, and by the conditions imposed upon it in its defence of itself against capitalist onslaught attempting to destroy it.